Can't connect to Database

I’ve moved a bbpress install for a client, and I’m seeing the strangest bug – Client has bbpress, and the bbpress “latest” plugin for showing the posts on his main page. The latest plugin works great, accesses the DB and all, the bb though – can’t access the DB. Same username/pass/database/host, file has correct permissions so it can read it – everything looks great..but BB continually can not reach the DB.

I’ve deleted/recreated the file, I’ve done it all – any tips? We rsync’d the files from the other host, and it worked fine prior.